thanks reply. yes, after search this forum, i understand this. and also find a nice way to use this. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4117812#4117812 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4117812